Synthflow
AI voice agents that handle inbound and outbound business calls at scale, without adding headcount.
Independent overview by new Mantra · updated July 15, 2026
- Category
- Customer Service
- Pricing
- Enterprise contracts start at $30,000/yr (scoped by call volume, concurrency, telephony, integrations, security, and launch support).
- Implementation
- 6-10 weeks
- Adoption risk
- Medium
- Integrates with
- HubSpot, Salesforce, Zapier, GoHighLevel, Cal.com, Google Cloud
What Synthflow does
Synthflow is an end-to-end platform for building and running AI voice agents that automate phone calls. It handles common call tasks such as routing callers to the right place, booking appointments, qualifying leads, and sending SMS follow-ups — all without a human picking up the phone. The platform supports both inbound and outbound call flows.
Rather than relying on a third-party carrier, Synthflow runs its own telephony network, which gives it direct control over call routing, latency, and uptime. The platform claims sub-100ms latency and 99.99% uptime, and it is certified for SOC 2, HIPAA, PCI DSS, and GDPR — making it relevant for regulated industries such as healthcare and financial services.
Agents are built using a visual flow designer, tested in a simulated environment before going live, and monitored continuously once deployed. The platform connects to solutions many business teams already use, including HubSpot, Salesforce, Zapier, GoHighLevel, Cal.com, and Google Cloud, so call data and actions can feed into existing workflows rather than sitting in a separate silo.
Key capabilities
Inbound and Outbound Call Automation
Agents can answer incoming calls or place outgoing ones, handling tasks like routing, FAQs, appointment booking, and lead qualification without a human agent involved.
In-House Telephony Network
Synthflow operates its own communications infrastructure, which it says keeps latency below 100ms and uptime above 99.99%. It also supports connection through your existing SIP trunks or PBX setup.
Structured Agent Testing
Before any agent goes live, a built-in test centre runs simulated calls to measure accuracy, response quality, and compliance against defined KPIs.
Continuous Monitoring and Improvement
Once deployed, automated quality analysis reviews every conversation in real time, feeding insights back so agents can be refined over time.
CRM and Workflow Integrations
Synthflow connects to over 200 solutions, including HubSpot, Salesforce, Zapier, and GoHighLevel, so agents can update records, trigger follow-ups, and slot into existing processes without custom development.
Omnichannel Conversation Handling
Beyond voice calls, the platform supports chat and SMS from the same interface, so teams can manage multiple communication channels under one system.
Best for
- Businesses handling high call volumes who want to automate tier-1 support, scheduling, or lead qualification without hiring additional staff
- Teams in healthcare, financial services, or retail where call handling compliance (HIPAA, PCI DSS, GDPR) is a hard requirement
- Organisations already using HubSpot, Salesforce, or similar CRMs who want call activity and outcomes to flow directly into existing records
- Companies that need agents running after business hours or across multiple languages without extending human shift coverage
- Enterprises with existing telephony infrastructure (SIP or PBX) that want to add voice AI without replacing what they already have
Worth knowing
- Enterprise contracts start at $30,000 per year, scoped by call volume, concurrency, and integrations — this is not a lightweight or low-cost entry point for small businesses
- Implementation is estimated at 6 to 10 weeks, so teams with immediate needs or no internal project capacity should plan accordingly
- The free tier lets you build and configure agents at no cost, but you move to pay-as-you-go pricing the moment agents go live on real calls — budget planning matters before launch
- Getting full value from the platform requires clear call flow logic, defined escalation rules, and connected CRM or backend systems; businesses without these in place will need to invest time before deployment
- If your call volumes are modest or your use case is straightforward, the platform's enterprise feature set and pricing may be more than you need — simpler voice solutions could be a better fit
Most businesses looking at Synthflow are really trying to stop leads leaking out of missed calls. If that is the problem, start with where your leads are actually going — it puts a number on what the missed calls cost before you pick a solution.
Related solutions
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